/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { ts, rule } from "qvog-dsl";

const SEVERITY = 2;
const DOC_PATH = 'docs/no-multiple-blank-lines.md';
const DESCRIPTION = 'Avoid having more than 2 consecutive blank lines, which affects code readability.';

export default rule()
  .match(ts.isSourceFile)
  .when(node => {
      const text = node.getFullText();
      // 匹配连续的空行
      const consecutiveBlankLines = text.split(/\r?\n/).reduce((acc, line) => {
          if (/^\s*$/.test(line)) {
              acc.current++;
              if (acc.current > acc.max) acc.max = acc.current;
          } else {
              acc.current = 0;
          }
          return acc;
      }, { current: 0, max: 0 });
      return consecutiveBlankLines.max > 2;
  })
  .report({
      severity: SEVERITY,
      description: DESCRIPTION,
      docPath: DOC_PATH,
  });
